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I have a Dell XPS 8300, and its got an ATI Radeon HD6450 installed. When running Ubuntu 12.04 the triple monitors work flawlessly. I can change the default, turn them on/off etc ...

The problem is Windows 7. It is behaving much like in this thread. I know the card supports three, as it WORKS PERFECTLY in the linux portion of my dual boot. Windows can "see" all three, but will only allow two. Is this a WIndows 7 / ATI compatibility issue, or is Windows 7 just stupid (rhetorical)? Had I not had a dual boot Linux box, I might have read the above thread and thought "damn, it just won't work". But I use three monitors every day on this card, so I know it works.... Just not with Windows.

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What ports are you using? You can't use two DVI ports at the same time. –  Brad Patton Dec 5 '12 at 23:47
    
I am using HDMI, DVI and VGA. Three displays work perfectly in Linux (Ubuntu 12.04), So I know the card supports concurrent connections to ports I am using. –  Zak Dec 5 '12 at 23:49
    
I have a similar card and on Windows I needed to use the mini display port and an active adapter. Not sure about Linux, sorry. –  Brad Patton Dec 5 '12 at 23:53

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